Arsenal's dispiriting season took a turn for the worse on Tuesday as the Gunners crashed to a 2-1 defeat at Olympiakos that ended their hopes of finishing top of Champions League Group B.

Arsene Wenger's side desperately needed a victory in Athens to ease the sense of crisis enveloping the north London club after their worst start to a Premier League campaign in the Frenchman's 16-year reign.

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But instead the Gunners squandered the lead secured by Tomas Rosicky as second half goals from Giannis Maniatis and then Kostas Mitroglou meant Arsenal had to settle for second place in the group behind Schalke.

In other results, Paris Saint-Germain and Schalke sealed top spot in their Champions League groups, while Cristiano Ronaldo scored his tournament-leading sixth goal to help Real Madrid beat Ajax 4-1.

A 17-minute snow delay during the Dinamo Zagreb-Dynamo Kiev match offered something unexpected on a night when all places in the last 16 were decided before kickoff.

Kaka also scored for Madrid, while PSG beat pre-match leader FC Porto 2-1 to top Group A.

Arsenal's loss allowed Schalke to be No.1 in Group B despite drawing 1-1 with Montpellier.

Ajax, Zenit St. Petersburg, Kiev and Olympiakos enter the last 32 of the Europa League.